Finally, as the soul is purified from all sensual affections and desires, it attains to liberty of spirit, wherein the twelve fruits of the Holy Ghos… - John of the Cross

God has to work in the soul in secret and in darkness because if we fully knew what was happening, and what Mystery, transformation, God and Grace will eventually ask of us, we would either try to take charge or stop the whole process.

Seek in reading and you will find in meditation; knock in prayer and it will be opened to you in contemplation.

THE darkness of which the soul here speaks relates, as I have said,1 to the desires and powers of sense, interior and spiritual, all of which are deprived of their natural light in this night, that, being purified as to this, they may be supernaturally enlightened. The desires of sense and spirit are lulled to sleep and mortified, unable to relish anything either human or divine; the affections of the soul are thwarted and brought low, become helpless, and have nothing to rest upon; the imagination is fettered, and unable to make any profitable reflections, the memory is gone, and the will, too, is dry and afflicted, and all the faculties are empty and useless,2 and, moreover, a dense and heavy cloud overshadows the soul, distresses it and holds it as if it were far away from God. This is the darkness in which the soul says that it travels in safety. 2. The reason of this